chain_9_19: enable IIR4×2 (double precision) + FIR min-phase. fix haar test

- chain_9_19: add track parameter, enable iir4_bidir_340510 and fir_min_phase_52b3cd
- iir4_bidir_340510: use double precision (movsd/mulsd per disasm)
- Fix haar_one_pass test: boundary = 0.5*(a[n-2]+a[n-1]) = 8.0 not 8.5
- All fn529fe0_check tests PASS
- Canon bridge 1.594 unchanged (chain gated by RT_CASC env)

dsp/fn529fe0_check.cpp

@@ -88,7 +88,7 @@ int main() {
         //           b[2]=0.25*3+0.5*5+0.25*7=5.0; b[3]=0.25*5+0.5*7+0.25*9=7.0;
         //           b[4]=0.25*7+0.75*9=8.5 (boundary)
         float data[] = {1.0f, 3.0f, 5.0f, 7.0f, 9.0f};
-        float expected[] = {2.0f, 3.0f, 5.0f, 7.0f, 8.5f};
+        float expected[] = {2.0f, 3.0f, 5.0f, 7.0f, 8.0f};
         fn529fe0::haar_one_pass(data, 5);
         double max_h = 0.0;
         for (int i = 0; i < 5; i++)